![]() ![]() In terms of theoretical research, there is no final conclusion about the causes of this phenomenon. At the same time, due to the poor repeatability and unrepresentativeness of the selected research objects, the practical application of the research achievements is highly limited. However, it is equally notable that the experimental research puts forward high requirements upon the scheme design and implementation conditions, and the research on the deformation mechanism of deep surrounding rock needs to impose a large stress field, which poses a new challenge to the test equipment. ( 2014) proposed that a weak interlayer was a key factor affecting zonal disintegration for the first time. ( 2021) revealed the occurrence conditions of zonal disintegration based on the self-developed confining pressure support test system. ![]() From the in-situ test results, Hui observed that the thickness of the rupture zone decreased with the distance from the surface of the roadway and that the fragmentation degree decreased whereas the integrity increased (Hui et al., 2018). ( 2008) discovered that the maximum in-situ stress parallel to the tunnel axis was the main cause of zonal disintegration. ![]() ( 2011) studied the zonal disintegration under dynamic-static combined loading through model tests. ![]() simulated the zonal disintegration through three-dimensional (3D) geomechanical model test (Q. In terms of experimental research, Zhang et al. Schematic diagram of zonal disintegration Li et al., 2008), Huainan Zhuji mining area (Zhu et al., 2010), and Jinping hydropower station (S. The phenomenon of zonal disintegration has also been found in Huainan Dingji mining area (S. ( 1986a, 1986b, 1987, 1989), Guzev and Paroshin ( 2004), and Borzykh ( 1990) also verified the existence of this phenomenon through field observation and experiments. Cloete (Adams & Jager, 1980 Cloete & Jager, 1972 S. This phenomenon has attracted much attention from scholars both at home and abroad since it was discovered by D.R. Zonal disintegration of the chamber surrounding rock (or zonal disintegration, zonal fracturing) is the phenomenon of cyclical rupture zone and nonrupture zone in the surrounding rock of a deep-buried chamber, which is different from that of the shallow chamber (H. Numerical simulation of zonal disintegration of surrounding rock in the deep-buried chamber These results reveal the influence law of zonal disintegration and provide theoretical support for the design of deep-buried chambers. In the reverse case, zoning fracture appears remarkably in the surrounding rock around the chamber. (3) The zoning fracture is not obvious in the case of. Smaller U cs and larger σ will lead to zonal disintegration. (2) Zonal disintegration is affected by both σ (in situ stress) and U cs (uniaxial compression strength). In the extension process, a single rupture zone may be forked into two or even multiple rupture zones, which cross each other and form the zonal disintegration zone. The results show that: (1) after the chamber excavation, multiple rupture zones gradually extend from the chamber surface or adjacent periphery to the deep surrounding rock. The influences of buried depth, cohesion, and internal friction angle of surrounding rock on zonal disintegration were analyzed to reveal the influence law. Based on the finite difference software FLAC 3D, the numerical simulation of surrounding rock with different mechanical parameters was conducted by using the SU model (Bilinear Strain-Softening Ubiquitous-Joint). Zonal disintegration is the phenomenon of cyclical rupture zone and nonrupture zone in the surrounding rock of a deep-buried chamber, which is different from that of a shallow chamber. ![]()
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